Avalanche

JFS Canyon - Running Rabbit Mtn

Adam ClarkFlathead Range & Glacier NP
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Observation photo 1Observation photo 2

Quick report

• Snowpack is thin and patchy or non-existent on sunny slopes below 5000’ elevation. • Recent snowfall totals from the past few days ranged from 2-3” on the Canyon floor and 6-8” above 6000’. • This recent snow was cooked today on sunny aspects and a new surface sun crust began to form as this terrain became shaded later in the day. • Noted a few recently formed 6-12” thick wind slabs above 7000’, mostly on easterly aspects. These were unreactive to ski cuts. • Underneath the recent snow we have a thick new crust due to last week’s warmup and the subsequent cool down over the weekend. This was supportable in skis and sometimes boots. We measured it at 6-7” thick around 6000’ on sunny aspects. • Dug a snow pit in the Shed 11 path at 6400’, south aspect, 29° slope. Snow depth here was only about 20” and basically consisted of three layers: the recent snow, the recent crust under that, and then wet grains to the ground. Extended Column Test yielded ECTP 21 and 19 right underneath the crust (pit profile). • Dug a second snow pit in the uppermost reaches of Shed 10 at 7300’, ENE aspect, 30° slope. Snow depth here was 36” with only about 3” of recent snow resting on top of a 2” thick, 1F-hard crust formed over the weekend. Snowpack was dry throughout. ECTN14 just under the crust and CT12 Q2 on same layer.

Weather

Cloud Cover
few
Wind Loading
previous
Snow Avail For Transport
moderate amounts

• Scattered clouds with no precipitation and pretty much calm winds at all elevations. • Daytime high air temperatures reached 40°F on the Canyon floor, the mid-30s °F at 6400’, and right at the freezing mark at 7000’.

Avalanche

• Avalanche activity today was limited to a few D1 wet loose on steep southerly slopes at elevations above 5500’. • Confirmed there were no slab avalanches in Path 1163 and Shed 10 last week during the warmup. Only the previously reported wet loose avalanches. • Excellent views today of distant terrain in the park and Flathead Range and no avalanches observed save for a few D1 wet loose and rollerballs.